I always pull pork butts at the end of any cook whether we eat it or not it makes for a better reheat But I would think put it in an oven at 200 bring up to temp 160 then pull it.
In my opinion if hickory is the king of hard wood than oak is the queen of hard wood, nice flavor not so heavy as hickory and with the two of them it’s a nice mix. Also you can mix in a little apple for its fruitiness
I would take the thinner of the two and put that on the lower grate. Are you going to rest them for more that an hour if so I would take them off at 185 deg.and let the carry over heat finish them to the 193deg. That you want